Great star, so how can he be an awful hack to many? (7)
I believe the answer is:
beckham
'great star so how can he' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'be an awful hack to many?' is the wordplay.
'an awful' is an anagram indicator.
'to many?' becomes 'm' (Roman numeral for a thousand).
'hack' anagrammed gives 'ckha'.
'be'+'ckha'+'m'='BECKHAM'
Can you help me to learn more?
(Other definitions for beckham that I've seen before include "Red" , "David, footballer" .)